Gas-mixing device



July 8', 192%. 1,500,905

E. THOMAS J! ll GAS MIXING DEVICE Filed AuZ. 4. 1923 l'nuanlol' Edgar Thamaks 14; 99 v [fa/W456.

Patented July 8, 1924 UNITEDSTA TESY EDGAR THOMAS, 015 JARROW-ON-TYNE, ENGLAND.

; GAS-MIXING DEVICE.

Application filed august 4, 1923. Serial No. 655,731.

To all whom it may concern:

Be it known thatI,.EDcAR THOMAS, a subject of the King of England, residing at Jarrow-on-Tyne, in the county of Durham,

England, have invented certain new and useful Improvements in Gas-Mixing Devices, of which the following is a specification.

This invention is for improvements in or relatingto gas-mixing devices andis applicable to any apparatus such, for example, as gas-fuel burners, wherein two gases are to. be mixed in definite proportions. The primary object of the invention is to provide means whereby the proper relative proportions of the two gases may automatically be kept substantially constant, throughout fluctuations in the flow of one or other of the two gases. 7 a

According to the present inventionthere is provided in a gas-mixing device wherein two gases are conveyed by two conduits to a point of admixture, fiow regulating means comprising a movable. bafiie locatedin one conduit and yieldingly held against the flow 01 gas therein, a valve controlling the fiow of gas in the other conduit, and means so operatively connecting together said battle and valve as to cause thegmovement of the bafi ie to operate the valve, for the purpose of to automatically maintaining substantiallyconstant the relative proportions of .the two gases by increasing or decreasing the flow of gas through the valve in proportion to the increase or decrease respectively of the flow of gas past the balfie.

Preferably thevalve, the yielding control of thebaifie and/or the means operatively connecting the battle .with the valve are adjustable to vary the relative proportions of the two gases.

In certain applications of the invention, for example in gas-fuel burners, it is desirable that fluctuations in the flow of gas in either of the two conduits should be compensated for, and according to a further feature of this invention the said baflie may be yieldingly held against the fiow of gas passing it by means of a second movable baffle located in said other conduit and so operatively connected to the first mentioned bafile that under the combined opposed action of the two flows of gas the bafiies balance one another. Thus any excess of gas flowing through the valve will upset the balance of'the bafiles and will move them and PATIENT OFFICE.

operate the'valve until the balance is re stored.

In the accompanying drawings which illustrateby, way ofexample forms of the invention as applied to a gas-fuel burner- Figure 1 is a sectional elevation through a burner illustrating one form of the invention, f I

Figure 2 is a sectional elevation through a burner illustrating another form of the invention, and r 7 Figure 3 is atransverse section through the burner on the line 3-3 of Figure 2, and

Figure 4; shows a modification of the construction illustrated in Figure 2. I Q

Referring first to Figure 1, the burner comprises two gas conduits 1 and 2 for gas and air respectively. The gas conduit 1 and the air conduit 2 both leadinto a cylindrical chamber 3. A diaphragm & divides, the chamber 3 into two portions andfuponth'is diaphragm are mounted a series of gas nozzles 5 which project into the forward part of the chamber 3 and, operate to projcct the gasfuel from the burner and induce a supplyof air from the. conduit2 to support combustion. The gas is supplied under pressure and the air is induced partly by the injecting or aspirating effect of the nozzles and partly by chimney draught when the burner is applied to a furnace.

Located in the conduits 1 and 2 are discshaped baifies' 6 and 7 which aresuspended from two points of a counter-balance lever 8 pivotally mounted upon a support 9 secured to the top of the chamber 3. The disc 6 is suspended from the lever S by means of a rod 10 passing at 11 gas-tight through the chamber 3. The disc 7 is suspended from the lever 8 by means of a rod 12 which also carries a valve 13 controlling the air inlet '2,

The arrangement is such that'when the required proportions of the two gases are flowing there is no movement of the discs, the upward pressure of the gas on the disc 6 counterbalancing the downward pressure of the air on the disc 7, but should the relative proportions vary for example by an excess of gas or a deficiency of air, caused say by a fluctuation in chimney draught, the two discs react upon one another and open or close the air valve 13 until the balance of the discs is restored. I

Generally the desired ratio of air to gas Will, e about 9-7 to ,1,- The areas of t e gas and air pass e pas the t amm s 6 and 7 are the same so that the volumes of gas and air will be exactly in proportion to their velocities past'l-thefdi'scfs'. Assumingthat the densities of the gas and air are equal the pressure on the discs will varyas the square of the velocitycof the gas or air so that if the distances "from the fulcrum 0. .5 t e leve t t e P s susp sion o tlliel'rod i0 a d iz be 'intl e'ratio 0150.7 to rather is"0149 to"1','the system'willbe in Refernertia b gures 2 and B, e sp rfi ii th rns pr pe s s iallythe same as before. The flow regulating 'm'eans, however, are such asto com-- pen sate only for fluctuation of flow in the gasoilduit. Theycomprise a disc-shaped base 14 suspended by arod 15 from an arm 1Q of a lever pivotally mounted at 1 7up'on than?" inlet--21" This lever is provided "with t'lireearmfs'lti, 18fand 19/3The arm 19 is pivotall'yconnected by'a linl; 201with a lever 21 which operatesa' butterfly air alve 22.

The {arm '18 "carriesla counter-poise "weight 28""which'n1ay be adjustable towards and awar -awe r et l fiexcess of -gas will raise the disc 14 against "the counter-poise weighti23to ope rate"the air valve 24 with the r'esultthat of gas compensated for but also variation in both chimney draught and the inductionieffctof the nozzles 5, whereas with the other construction and that shown in Figure 4 variation iii chimney draught and nozzle induction effect is not compensated for. It will be understood that the description above given. is by way of example only and various modifications may be made within the scope of the invention.

What i -la'ifm as invention and desire to secure by Letters Patent is z i 'lf'Ina fluid-mixing device, the combination with two conduits-leading to a point of admixture of fluids conveyed through them, of flow-regulating means comprising a movable baffle located in one of said conduits, a second movable baflle located in the second of said conduits, a valve controlling theflow of fiuidin the said second conduit and operatively connected to said second b'aflie, and means so operatively connecting the two baffles together that the -iorces'operativ'e oh the balil'es" under the combined opposed action ofthe two currentsof fluid balance one another, substantially as described. i

'2. In a governor device of the kind described, the combination of a casing member containing a mixing chamber, and two conduits leading to said chamber, of flow- 'regi'i'lating'v means comprising a movable baffie member located in one of said can: duits, a second movable battle-member located in the second of said conduits, alever fulcruined on said casing member, andmeans so operatively connecting the bafileineinb'ers' each to said lever that the forces operative on the battle members under the combined opposed action ofthe two currents in the conduits, balance one another, substantially as' described. a

3; In an airiand gas mixing device; the combination of a'casin'g member containing a mixing chamber, a gas conduit and an air conduit leadingto said chamber, of a lever fulcrurned onsaid casing member, a valve operatively connected'to'said' lever and arranged to control said air conduit, a battle in .saidfair conduit, a battle in said gas conduit, and means so connecting said baiiles to said lever that the forces operative on the baffles under the action ofthefiow "of air and gas tend to'rock the lever in opposite directions, substantially as described.

In testimony whereof I aifix' my signature.

EDGAR THoMAs." 

